Calculating the Specified Ratio:
If Star – Star Transformer: Ratio K = HV Specified voltage / LV Specified Voltage
If Delta – Star Transformer: Ratio K = 1.732 * (HV Specified voltage / LV Specified Voltage)
If Delta – Delta Transformer: Ratio K = HV Specified voltage / LV Specified Voltage
Procedure:
1. In Ratio Meter just rotate the dial and directly measure the value.
2. By apply separate voltage and measure using Meters.
i) Apply Single Phase/ phase to Phase/ All three phases as per availability. Measure the output.
ii) For easy reference apply 2 phase, that means 1st U & V,2nd V & W, finally W & U.
iii) The output must be V out = Applied voltage/ Specified Ratio (K)
Error:
Calculating the error is E = Specified Ratio ± Measured Ratio
( +) % Error = (100 * (Specified Value/Measured value)) – 100
( - ) % Error = (100 * (Measured value/ Specified Value)) – 100
Posted By: B.K, boopathymail@gmail.com, transtechindia33@gmail.com
Friendship
15 years ago
No comments:
Post a Comment